KR20110057634A - Lens assembly and camera module - Google Patents

Abstract

PURPOSE: A lens assembly and a camera module are provided to automatically prevent a tilt by closing adhering a rib to a mount surface in a lens assembly process. CONSTITUTION: A lens barre(112) has a receiving space inside and a tapered mount surface. A lens unit(114) has a tapered rib corresponding to the mount surface. Lenses are stacked on the mount surface. A spacer(140) is interposed between lenses.

Description

Lens Assembly and Camera Module

The present invention relates to a lens assembly and a camera module, and more particularly, to a lens assembly to which a plurality of lenses are mounted and a camera module including the same.

Recently, with the development of communication technology and digital information processing technology, personal handheld terminal technology incorporating various functions such as information processing and arithmetic, communication, image information input and output has been newly emerging.

Examples of the personal mobile terminal include a digital camera, a PDA equipped with a communication function, a mobile phone with a digital camera function, and a personal multi-media player (PMP).

In addition, due to the development of digital camera technology and information storage capability, the mounting of a high specification digital camera module is increasingly common in such personal portable devices.

These camera modules are growing differently each day as the competition for technology is intensifying. In particular, camera modules for personal handheld devices are highly miniaturized, ultra-thin, and high-pixel lens design technology, high-precision mold technology, injection molding technology, and precision assembly technology. Production techniques, design techniques for the lens assembly structure, and the like.

In particular, the lens assembly mounted on the camera module may generate a tilt phenomenon of the lens generated when the lens is assembled, which causes a serious problem of resolution. Thus, there is a need for techniques to solve this problem.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a lens assembly having a structure that can prevent the tilt when assembling the lens and a camera module including the lens assembly.

The lens assembly according to the present invention includes a lens barrel having a receiving space formed therein, the seating surface is formed in a tapered shape; And a lens unit including a laminated lens having tapered ribs formed to correspond to the seating surface.

In addition, the lens unit of the lens assembly according to the present invention may include a plurality of lenses, and may further comprise a spacer interposed between the lenses.

In addition, the spacer of the lens assembly according to the invention may be characterized in that it comprises a tapered inclined surface to correspond to the seating surface.

On the other hand, the camera module according to the present invention includes a lens portion having an accommodating space therein, a lens barrel having a seating surface formed in a tapered shape, and a laminated lens formed with tapered ribs so as to correspond to the seating surface. Lens assembly; A housing in which the lens assembly is received; And a substrate unit assembled to the housing and having an image sensor having an imaging area for receiving light passing through the lens assembly.

In addition, the lens unit of the camera module according to the present invention may include a plurality of lenses, characterized in that it further comprises a spacer interposed between the lenses.

In addition, the spacer of the camera module according to the invention may be characterized in that it comprises a tapered inclined surface to correspond to the seating surface.

In addition, the camera module according to the present invention may further include a flat portion protruding from the end of the lens barrel to maintain the flatness of the lens barrel.

In addition, the flat portion of the camera module according to the present invention may be characterized in that the projecting piece is formed in a cylindrical shape.

The lens assembly and the camera module according to the present invention have a lens barrel in which a seating surface is formed in a tapered shape and a laminated lens in which tapered ribs are formed so as to correspond to the seating surface, so that the ribs are in close contact with the seating surface during assembly. Tilt can be prevented.

A lens assembly and a camera module according to the present invention will be described in more detail with reference to FIGS. 1 to 6. Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention.

However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention may deteriorate other inventions or the present invention by adding, modifying, or deleting other elements within the scope of the same idea. Other embodiments that fall within the scope of the inventive concept may be readily proposed, but they will also be included within the scope of the inventive concept.

In addition, components having the same functions within the same or similar scope shown in the drawings of each embodiment will be described using the same or similar reference numerals.

1 is a schematic cross-sectional view for describing a camera module according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a lens assembly for explaining a lens assembly mounted to the camera module of FIG. 1.

1 and 2, the camera module 100 may include a lens assembly 110, a housing 120, and a substrate unit 130.

The lens assembly 110 is assembled to an open upper portion of the housing 120 and may include a lens barrel 112 and a lens unit 114.

The lens barrel 112 has an accommodating space formed therein to accommodate the lens unit 114. The inner space of the accommodating space may be formed in a stepped manner so that each lens may be seated among a plurality of lenses. Can be.

In addition, a mounting surface 113 formed in a tapered shape may be formed at a portion of the lens barrel 112 close to the object side.

In this case, the seating surface 113 may be formed in an inclined shape to face the opening. However, the present invention is not limited to this inclination, and according to the intention of the designer, the seating surface may be formed to be inclined from the opening toward the inner surface.

The lens unit 114 includes a plurality of lenses, and the number of lenses may be variously set according to a designer's intention.

In addition, a spacer 140 may be disposed between each lens. At this time, the spacer 140 serves to adjust the gap between the lens and the lens, the material may be formed of a transparent material or an opaque material.

The lens unit 114 may include a laminated lens 116 in close contact with the seating surface 113 of the lens barrel 112. Here, the laminated lens 116 includes a rib 117 formed in a tapered shape to correspond to the seating surface 113. Therefore, the laminated lens 116 can be accurately seated on the mounting surface 113 of the lens barrel 112 by the tapered rib 117.

The housing 120 may include a barrel water groove coupled to the lens barrel 112. In this case, the outer surface of the lens barrel 112 may be formed with a male screw portion and the barrel receiving groove may be designed such that the female screw portion that can be screwed with the lens barrel is formed on the inner circumferential surface of the inner hole.

With this structure, the lens barrel 112 is moved with the lens in the optical axis direction with respect to the fixed housing 120, it is also possible to perform the focus adjustment operation by changing the focal length between the lens and the image sensor 132. have.

In addition, the lower portion of the housing 120 may have a space that is opened to be sealed by the substrate unit 130. Therefore, in the assembled structure of the housing 120 and the substrate unit 130, the optical axis of the image sensor 132 mounted on the upper surface of the substrate unit 130 and the lens of the lens barrel 112 automatically coincide.

The substrate 130 may be attached to the bottom of the housing 120, and the image sensor 132 may be connected to the top by wire bonding. In this case, the method of connecting the image sensor 132 is not limited to wire bonding. In addition, the substrate unit 130 may use a rigid substrate or a flexible substrate.

In addition, the substrate 130 and the housing 120 may be bonded to each other through a separate adhesive, and the method of adhering to each other may be performed by applying the adhesive along the four corners of the substrate 130 to form the housing 120. It can be formed by mounting at the bonding position.

However, the method of adhering the substrate 130 and the housing 120 is not limited thereto, and it is also possible to design the protrusions projecting to the lower portion of the housing and the grooves formed in the substrate to be bonded to each other according to the intention of the designer.

The following is a more detailed description of the components shown in FIG.

In addition, the housing may further include an actuator (not shown) capable of reciprocating the lens in the optical axis direction when the power is applied.

The actuator is a VCM (Voice Coil Motor) using a magnet and a coil to realize lens movement by an electromagnetic force generated by the electric field generated by applying power to the coil and the magnetic field generated by the magnet, and a piezoelectric body when the power is applied. It may be provided in various forms such as a piezo actuator (Piezo Actuator) using a piezoelectric material to realize the movement of the lens by the deformation of.

In addition, although not necessarily a component in the present embodiment, the infrared filter (IR) filter 150 that can filter the infrared rays of the light passing through the lens may be provided by bonding bonding inside the housing 120.

In addition, the image sensor 132 has an image forming region on the upper surface to form light incident through the lens, and is an imaging device capable of converting it into an electrical signal.

The image sensor 132 may be mounted on the upper surface of the substrate 130 by wire bonding. However, the method of electrically connecting the substrate portion is not limited to the wire bonding method.

3 is a schematic cross-sectional view illustrating a method of assembling a lens in a lens assembly according to an embodiment of the present invention.

Referring to FIG. 3, the lens barrel 112 is disposed such that the opening near the object side in the lens barrel 112 faces downward. In this case, as mentioned above, the surface close to the opening may be a seating surface 113 tapered at an angle.

In addition, a plurality of lenses and spacers are sequentially stacked in the inner space of the lens barrel 112. At this time, in this embodiment, the lens that is in close contact with the seating surface 113 is defined as the laminated lens 116.

In addition, the laminated lens 116 includes a rib 117 formed in a tapered shape so as to correspond to the seating surface 113, and the laminated lens 116 is disposed such that the rib 117 is in close contact with the seating surface 113. It will be assembled to the lens barrel 112 (arrow).

In general, when a laminated lens having no tapered shape is assembled in the lens barrel 112, the lens may be tilted while the seating position is shifted.

In addition, when the laminated lens is tilted and assembled, the lenses assembled thereafter may inevitably be tilted, thereby causing a problem in that the resolution of the lens falls.

However, in the present embodiment, the laminated lens 116 including the rib 117 formed in the tapered shape is in close contact with the seating surface 113 having the same tapered shape and is naturally positioned at the correct position by the tapered surface. Since it is in close contact with the lens 114 can be prevented from being tilted, by this tilt can solve the problem that the resolution of the lens falls.

4 is a cross-sectional view illustrating a lens assembly according to another exemplary embodiment of the present invention.

Referring to FIG. 4, the lens assembly 110 may include a lens barrel 112, a lens unit 114, and a spacer 240.

At this time, the lens barrel 112 and the lens unit 114 in the present embodiment substantially the same configuration as the previous embodiment and the detailed description thereof can be omitted.

Here, the spacer 240 may be disposed between each lens, and may serve to adjust the gap between the lens and the lens.

In this case, one surface of the first spacer 242 in close contact with the laminated lens 116 may have an inclined surface having a tapered shape in the same manner as the rib 117 of the laminated lens 116.

In addition, the lens 118 in close contact with the inclined surface of the first spacer 242 may have a shape in which the ribs are tapered.

Therefore, since the lens unit 114 assembled in the inner space of the lens barrel 112 has a tapered shape, it is possible to solve the problem that the lenses are tilted at the same time as the previous embodiment.

5 is a cross-sectional view illustrating a camera module according to another embodiment of the present invention, and FIG. 6 is a perspective view illustrating a lens barrel of the camera module of FIG. 5.

5 and 6, the camera module 200 may include a lens assembly 210, a housing 220, and a substrate unit 230.

At this time, since the housing 220 and the substrate unit 230 in the present embodiment is substantially the same as the previous embodiment, a detailed description thereof may be omitted.

The lens barrel 212 may further include a flat portion 260 formed to protrude at an end to maintain flatness with respect to the lens barrel.

In addition, the flat part 260 may include a protrusion piece 262 protruding downward, and may be integrally formed with the lens barrel 212.

The protrusion pieces 262 protruding from the bottom surface of the lens barrel 212 are formed in a cylindrical shape, and the protrusion pieces 262 are disposed to be spaced apart from each other by approximately 120 degrees with respect to the optical axis of the lens barrel. However, the shape of the protruding piece 262 is not limited to this.

Therefore, in the present exemplary embodiment, only the flatness of the bottom surface of the protruding piece 262 needs to be managed, so that the tilt may be easily prevented when the lens barrel 212 is mounted on the housing 220.

1 is a schematic cross-sectional view for describing a camera module according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a lens assembly for describing a lens assembly mounted to the camera module of FIG. 1.

3 is a schematic cross-sectional view illustrating a method of assembling a lens in a lens assembly according to an embodiment of the present invention.

4 is a cross-sectional view illustrating a lens assembly according to another exemplary embodiment of the present invention.

5 is a cross-sectional view for describing a camera module according to another exemplary embodiment of the present invention.

6 is a perspective view illustrating a lens barrel of the camera module of FIG. 5.

Explanation of symbols on the main parts of the drawings

110,210 .... Lens Assembly 120,220 .... Housing

130,230 .... Substrate 112,212 .... Lens Barrel

113 .... Seating surface 114 .... Lens section

116 .... laminated lens 117 .... rib

120 .... Housing 130 .... Board

140 ... spacer 150 ... infrared filter

Claims (8)

A lens barrel having an accommodation space formed therein and having a seating surface formed in a tapered shape; And A lens portion having a tapered rib formed to correspond to the seating surface and having a laminated lens seated on the seating surface; Lens assembly comprising a. The method of claim 1, The lens unit includes a plurality of lenses, The lens assembly further comprises a spacer interposed between the lens. The method of claim 2, The spacer assembly, characterized in that the one surface comprises an inclined surface tapered shape so as to correspond to the seating surface. A lens assembly including a lens barrel having an accommodation space formed therein, a lens barrel having a seating surface formed in a tapered shape, and a tapered rib formed to correspond to the seating surface, and having a laminated lens seated on the seating surface; A housing in which the lens assembly is received; And A substrate unit assembled to the housing and having an image sensor having an image forming area for receiving light passing through the lens assembly; Camera module comprising a. The method of claim 4, wherein The lens unit includes a plurality of lenses, The camera module further comprises a spacer interposed between the lens. The method of claim 5, The spacer module, characterized in that the one surface comprises an inclined surface tapered shape corresponding to the seating surface. The method of claim 4, wherein And a flat portion protruding from an end portion of the lens barrel to maintain flatness with respect to the lens barrel. The method of claim 7, wherein The flat portion, The camera module, characterized in that the protrusion is formed in a cylindrical shape.

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